libstdc++-v3/testsuite/23_containers/array/tuple_interface/tuple_element_cpp14.cc

// { dg-do compile { target c++14 } }
//
// Copyright (C) 2015-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

#include <array>
#include <type_traits>
#include <testsuite_hooks.h>

void
test01()
{
  using namespace std;

  const size_t len = 3;
  typedef array<int, len> array_type;

  static_assert(is_same<tuple_element_t<0, array_type>, int>::value, "");
  static_assert(is_same<tuple_element_t<1, array_type>, int>::value, "");
  static_assert(is_same<tuple_element_t<2, array_type>, int>::value, "");

  static_assert(is_same<tuple_element_t<0, const array_type>,
                const int>::value, "");
  static_assert(is_same<tuple_element_t<1, const array_type>,
                const int>::value, "");
  static_assert(is_same<tuple_element_t<2, const array_type>,
                const int>::value, "");

  static_assert(is_same<tuple_element_t<0, volatile array_type>,
                volatile int>::value, "");
  static_assert(is_same<tuple_element_t<1, volatile array_type>,
                volatile int>::value, "");
  static_assert(is_same<tuple_element_t<2, volatile array_type>,
                volatile int>::value, "");

  static_assert(is_same<tuple_element_t<0, const volatile array_type>,
                const volatile int>::value, "");
  static_assert(is_same<tuple_element_t<1, const volatile array_type>,
                const volatile int>::value, "");
  static_assert(is_same<tuple_element_t<2, const volatile array_type>,
                const volatile int>::value, "");
}

int main()
{
  test01();
  return 0;
}